time包中的Add和Sub的用法，Add用于计算某个时间之前和之后的时间点，Sub用于计算两个时间差

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package main
 
import ("fmt""strings""time"
)
 
func main() {// Add 时间相加
    now := time.Now()// ParseDuration parses a duration string.// A duration string is a possibly signed sequence of decimal numbers,// each with optional fraction and a unit suffix,// such as "300ms", "-1.5h" or "2h45m".//  Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
 
 // 1分钟前
    m, _ := time.ParseDuration("-1m")
    m1 := now.Add(m)
    fmt.Println(m1)
 
    // 1个小时前
    h, _ := time.ParseDuration("-1h")
    h1 := now.Add(8 * h)
    fmt.Println(h1)
 
    // 一天前
    d, _ := time.ParseDuration("-24h")
    d1 := now.Add(d)
    fmt.Println(d1)
 
    printSplit(50)
 
    // 10分钟后
    mm, _ := time.ParseDuration("10m")
    mm1 := now.Add(mm)
    fmt.Println(mm1)
 
    // 1小时后
    hh, _ := time.ParseDuration("1h")
    hh1 := now.Add(hh)
    fmt.Println(hh1)
 
   // 一天后
    dd, _ := time.ParseDuration("24h")
    dd1 := now.Add(dd)
    fmt.Println(dd1)
 
    printSplit(50)
 
    // Sub 计算两个时间差
    subM := now.Sub(m1)
    fmt.Println(subM.Minutes(), "分钟")
 
    sumH := now.Sub(h1)
    fmt.Println(sumH.Hours(), "小时")
 
    sumD := now.Sub(d1)
    fmt.Printf("%v 天\n", sumD.Hours()/24)
 
}
 
func printSplit(count int) {
    fmt.Println(strings.Repeat("#", count))
}